1.,______,butter till bubbly; add in onion and celery and saute/fry till vegetables are soft but not brown.,2.,In bowl combine half the onion mix, veal, egg, saltines, salt, thyme and white pepper; mix well.,3.,Shape veal mix into 4 patties; sprinkle each with 1/4 tsp.,flour.,4.,In 10 inch nonstick skillet heat remaining tsp.,butter, add in veal patties and brown on both sides.,5.,Add in broth, mushrooms, and remaining onion mix.,Cover and simmer 20 to 25 min.